Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

That, too, was my gut reaction, but the MySQL gurus I talked with suggested it may be a deadlock, so I started to test for that, as, not being a true expert with MySQL, I had no concrete evidence that it wasn't a deadlock.

But, neither can I fathom what kind of bug can be in my code that would allow it to work 99.99% of the time, and give apparently random failures.

I wonder if it is a question of resource exhaustion, as suggested here by Anonymous Monk on Mar 29, 2014 at 00:21 UTC. That is something I am presently investigating. I finally found a resource monitor that will log resource use to a file for CPU cycles, memory, disk IO and network traffic. And, I have beefed up the logging done by MySQL. Hopefully, between those logs, and whatever you and other monks suggest is worth examination regarding whatever kind of bug I may have, I will get to the bottom of this RSN.

I am still interested in learning about these servers you mentioned (particularly FastCGI and XML::RPC, and how they can serialize insertions into a DB with reqeuests coming from multiple CGI processes, along with how much traffic will make such infrastructure mandatory

As for what my competition is doing, I have no idea. I watch industry reports, particularly those that report average response times for services like mine, response time being measured as the time the client software makes a request to the time it gets a response time back. Being competitors, I doubt they'll let me look at their code or the architecture they use. ;-) Back when I developed desktop applications in Java and C++ (I preferred C++ because it was, and still is, blindingly fast relative to Java, or any other language I can use), I found in some cases, it was just a case of using a compiled language rather than an interpreted language, and in a great many more cases, it was a question of using the wrong algorithm to complete the task (e.g. using a linear search through an enormous dataset, rather than the more sensible binary search). Now, if I can learn how to use C++ to handle requests using FastCGI, and could have a good library to add FastCGI support to my C++ projects, then I may well resort to that, at least if and when the traffic grows to a point where Perl could have trouble handling it (or use profiling information to find out where the bottlenecks are, and see if a package written in C++ can improve things). In what ways my competitors make their systems so slow, I can make educated guesses, but can not really know because I can't see their code.

BTW, perhaps you might had paraphrased Men in Black, rather than quoting it, to say, "Ted, We have a bug." ;-)

Thanks

Ted


In reply to Re^2: How do I handle a DB error when a SQL statement must not fail? by ted.byers
in thread How do I handle a DB error when a SQL statement must not fail? by ted.byers

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others pondering the Monastery: (6)
    As of 2014-12-28 03:18 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      Is guessing a good strategy for surviving in the IT business?





      Results (178 votes), past polls